Re: [whatwg/dom] window.event and shadow trees (#679)

We do adjust `e.target` (see https://dom.spec.whatwg.org/#concept-event-listener-invoke for details) during dispatch, but in the specific case of a shadow tree listener invoking a global function it will leak if either the global function already had access to `e` (capture listener) or gets it from `window.event`.

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